Chainsaw guide bar



FIG. 1 is a front side view of a guide bar according to one embodiment of the new design;

FIG. 2 is a rear side view thereof;

FIG. 3 is a right end view thereof;

FIG. 4 is a left view thereof;

FIG. 5 is a top view thereof; and,

FIG. 6 is a bottom view thereof.

All broken lines shown in the drawings are for environmental purposes only and form no part of the claimed design. 

The ornamental design for a chainsaw guide bar, as shown and described. 